JAMB Economics Past Questions & Answers - Page 107

531.

If the quantity supplied of a commodity increases from 20 to 30 units when there is an increase in price from N4 to N5, the elasticity of supply is

A.

4

B.

1

C.

2

D.

5

Correct answer is C

Percentage change in quantity supplied = (Change in quality supplied ÷ Old quantity supplied ) × 100
(30 – 20) ÷ 20 × 100
(10 ÷ 20) × 100 = 50%
Percentage change in price
(Change in price ÷ Old price )× 100
((5 – 4) ÷ 4) × 100
¼ × 100 = 25%
Therefore, the coefficient of price elasticity of supply is
Percentage change in quantity supplied ÷ Percentage change in price
50% ÷ 25% = 2

532.

In a situation when a firm is operating in a perfectly competitive firm and the total cost is given perfectly competitive firm and the total cost is given as N75.00. If the market price is N7.00 determine the profit. When 25 units are produced

A.

N75.00

B.

N100

C.

N175.00

D.

N125.00

Correct answer is B

Total cost (Tc) = N75.00

Price (P) = N7.00

Output (Q) = N25 units

Profit = ?

To derive the profit of the firm, the total revenue must be expressed. It can be expressed as

Total revenue (TR) = Price (P) × Quantity (q)

Therefore, TR = P × Q

= 7 × 25 units

Tr = N175

Therefore, Profit = TR – TC

= N175 – N75

Profit = N100

533.

The demand and supply functions of commodity x are given as follows: Qd = 20- 2p, Qs = 6p - 12 where p = price, Qd = quantity demanded and Qs = quantity supplied. Determine the equilibrium price

A.

N4

B.

N8

C.

N2

D.

N10

Correct answer is A

Qd = 20 - 2p

Qs = 6p - 12

Therefore, equilibrium price is Qd = Qs

20 - 2p = 6p-12

20 + 12 = 6p+2p

32 = 8p

Equilibrium price = 32/8= 4

Equilibrium price = N4

534.

What would encourage the growth of international division of labour?

A.

Improvement in transport system

B.

Instability in international exchange rate

C.

Restrictions on the movement of resources

D.

Increase in tariff

Correct answer is A

Efficient transport system encourages international division of labour.

535.

In the diagram, the consumer budget line shift from JK to GH. What can definitely be deduced from the diagram?

A.

There has been an increase in the consumer’s money income

B.

There has been a reduction in the price of both A and B

C.

There has been no change in the price of A or B

D.

There has been no change in the price of A relative to the price of B

Correct answer is B

Since a budget line imposed a constraint on an individual budget that he cannot buy more where the constraint is. An increase in income will make the consumer income higher that the price of the commodity which leads to shift in budget line from JK to GH